Process of dyeing



UNITED STATES PATENT OFFICE.

MARTIN E. WALDS'IEIN, on NEW YORK, .-Y., AND ARNOLD H. PETER, OF

NEWARK, NEW JERSEY. r

- PROCESS OF DYEING.

SPECIFICATION forming part of Letters Patent No. 523,560, dated July 24,1894.

Application filed February 15,1894- $erlal No. 500.313. (N0 p -l To allwhom it may concern.-

Be it known that we, MARTIN WALD- STEIN, of the city, county, and Stateof New York, and ARNOLD H. PETER, of Newark, county of Essex, and Stateof New Jersey, have invented a new and useful Improvement in Processesof Dyeing,'of which the following is a specification.

Our invention relates especially to that class of dyeing in whichstannic acid or oxid is used.

In describing our invention we shall hereinafter use the words stannicacid but we wish to be understood to mean by those words stannic acid oroxid.

Stannic acid is largely used in dyeing and a common mode is to use it inthe form of tetrachlorid of tin to cause the stannic acid to fasten onor in the fiber being dyed. The

come by treating the fiber, subjected to this stannic acid process ofdyeing, with a chemicalwhich will combine with the stannic acid in sucha manner as to form an insoluble or sparingly soluble salt, wherebyall'the benefits of the stannic acid process are preserved while theinjurious action does not occur. The chemical which we use to thusneutralize as it were, the stannic acid is, what is known as an oxid ofa metal in one of the following forms:. first, as a soluble salt of anorganic acid; second, as a soluble salt of an inorganic acidin analkaline solution; third, as oxid or hydroxide in a basic state; fourth,as a double salt.

' It should be clearly understood that our process is carried out in thestannic acid process of dyeing which is carried on in the usual way, ourprocess being a separate step and having as above explained in view theobject of neutralizing the injurious effects of such stannic acidprocess on fiber subjected thereto.

One way in which our invention can be carried out, and which we havefound highly satisfactory, is the following: After passing the fiberthrough the tin salts which are used for this purpose, the fiber is thenpassed through a bath (constituting our improvement in this process ofdyeing) which said bath is composed of a soluble salt of barium, madealkaline, preferably by ammonia; or through a bath composed of acetateof lead. Of course it is understood that the ammoniacal solution ofbarium or the solution of organic salt of lead, just spoken of, are onlyillustrative of our process Any other salts, coming within .thedescription hereto- It is well known that some metals form with stannicacid soluble salts. Of course our invention does not relate to those andwe desire to be understood as including only the metals which willcombine with stannic acid forming only insolubleor verysparingly'soluble salts.

The quantity of the oxid of the metal used the fiber which has beentreated by the stannic acid process is submitted to this bath',is a truecombination, and'the fiber will only take up 1 enough of theneutralizing chemical to effect the change in the stannic acid abovespoken of. It is therefore only necessary to see that in the bath.

What we claim as our invention, and desire to secure by Letters Patent,is-

1. The process of treating fiber consisting in immersing it in asuitable stannic acid solution; and then subjecting it to the action ofa metallic oxid which will form with stannic acid a salt insoluble orsparingly soluble in water, alkaline or acid solutions such as leadacetate, and then dyeing the same, substantially as described.

2. The process of treating fiber which consists in first immersing it inasuitable stannic acid bath, and in then subjecting itto the action ofacetate of lead, and in then dyeing the same, substantially asdescribed.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

MARTIN E. WALDSTEIN. ARNOLD H. PETER.

Witnesses:

ANTHONY GREF,

WM. A. POLLOOK.

there .is enough of the neutralizing chemical fore given can besubstituted for those named in this paragraph. 5

in preparing this neutralizing bath is immaterial, because theactiontakiug place, when

